I’m not certain, but this might be the only time mosh-pit dancing and stage diving has occurred on SNL, and inevitably they ended up causing $20,000 in damages to the show’s set. In the middle of the song, a Fear fan grabbed the mic and yelled, “F**k New York!” causing their set to be cut short. While the footage has since been shared, it was initially banned by the NBC network from ever being shown again.
An instrument’s strings are never perfectly in tune, and even the best violinists don’t place their fingers on the exact right place on the fingerboard. By alternating these two wonky A’s, Bach is drawing our attention to the physicality of the instrument, and to the way that the subtle microtones you get from physically playing it rub uncomfortably against each other. Guitarists use this same technique all the time, and it’s no big surprise that the chaconne sounds so great on guitar.